Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc00c264f325460…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d4ac2b8aa765b74c8126d28b6340040 SHA-1: 26021398f6db4ed7271a1d8d06b7fb3330d834ef SHA-256: 9cc00c264f32546009a8b49f3b5a5f2406aaa9873bd1dbca17b960695be41465
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous embedded URLs, many on disposable hosting and using UTM parameters, suggest a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=present+perfect+and+past+simple+worksheet PDF link annotation
    • https://davnosti.ru/upload/kukozibabawowadobe.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210913_799E9981500F6012.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/67944667281.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/ludajuwomi.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/36292785276.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/motunufoxumoredufe.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/puginulodegosaxukarota.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/20890443954.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/muzegolonefameluzirijovix.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/subavumuzanimiw.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/tupanopabujajazewigabe.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagozozobafaxobilik.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/varuwazof.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/15379008085.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/18q4vpn8vt7bq6nen6f7hja1qe/26200666314.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/xoritunadot.pdfIn PDF document text
    • http://vpsystem.com/files/fck/20312077141.pdfIn PDF document text
    • https://seerupit.dk/assens/file/labulepiw.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/58193185157.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/saxunefadove.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/vawofisusijinamirefafinow.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/60364392903.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufatewuvokapitiniz.pdfIn PDF document text
    • https://desmar.cl/gestion/admin/images/upload/file/10685530931.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 17504 bytes
SHA-256: a05c956a035aaea9c32f4d845ea3abadb9ea2ae57c8acb55c289aab3b81a85c5
font_01_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 11064 bytes
SHA-256: b17938a64a54defe2951fec06be43d4dd5a21761fa55924b7804cdf2886e6e64
font_02_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1